我确信这是一件非常简单的事情。当我运行我的ASP Web应用程序时，它在浏览器中出现以下错误：
Server Error in '/' Application.
Configuration Error
Description: An error occurred during the processing of a configuration file
required to service this request. Please review the specific error details
below and modify your configuration file appropriately.
Parser Error Message: Unrecognized element.
Source Error:
Line 23: <system.web> ## This line is highlighted in red ##
Line 24: <identity impersonate="true"/>
Line 25: <compilation debug="true" targetFramework="4.5" />
这是我的Web.config中我收到错误的部分。
...
<appSettings>
<add key="webpages:Version" value="3.0.0.0" />
<add key="webpages:Enabled" value="false" />
<add key="ClientValidationEnabled" value="true" />
<add key="UnobtrusiveJavaScriptEnabled" value="true" />
</appSettings>
<system.web>
<identity impersonate="true"/>
<compilation debug="true" targetFramework="4.5" />
<httpRuntime targetFramework="4.5" />
</system.web>
<system.webServer>
<validation validateIntegratedModeConfiguration="false" />
...